package org.bouncycastle.jcajce.provider.symmetric.util;
import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.InvalidParameterException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.ShortBufferException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEParameterSpec;
import javax.crypto.spec.RC2ParameterSpec;
import javax.crypto.spec.RC5ParameterSpec;
import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.DataLengthException;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.OutputLengthException;
import org.bouncycastle.crypto.modes.AEADBlockCipher;
import org.bouncycastle.crypto.modes.CBCBlockCipher;
import org.bouncycastle.crypto.modes.CCMBlockCipher;
import org.bouncycastle.crypto.modes.CFBBlockCipher;
import org.bouncycastle.crypto.modes.CTSBlockCipher;
import org.bouncycastle.crypto.modes.EAXBlockCipher;
import org.bouncycastle.crypto.modes.GCMBlockCipher;
import org.bouncycastle.crypto.modes.GOFBBlockCipher;
import org.bouncycastle.crypto.modes.OCBBlockCipher;
import org.bouncycastle.crypto.modes.OFBBlockCipher;
import org.bouncycastle.crypto.modes.OpenPGPCFBBlockCipher;
import org.bouncycastle.crypto.modes.PGPCFBBlockCipher;
import org.bouncycastle.crypto.modes.SICBlockCipher;
import org.bouncycastle.crypto.paddings.BlockCipherPadding;
import org.bouncycastle.crypto.paddings.ISO10126d2Padding;
import org.bouncycastle.crypto.paddings.ISO7816d4Padding;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.crypto.paddings.TBCPadding;
import org.bouncycastle.crypto.paddings.X923Padding;
import org.bouncycastle.crypto.paddings.ZeroBytePadding;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.crypto.params.ParametersWithSBox;
import org.bouncycastle.crypto.params.RC2Parameters;
import org.bouncycastle.crypto.params.RC5Parameters;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.spec.GOST28147ParameterSpec;
import org.bouncycastle.jce.spec.RepeatedSecretKeySpec;
import org.bouncycastle.util.Strings;
public class BaseBlockCipher
extends BaseWrapCipher
implements PBE
{
//
// specs we can handle.
//
private Class[] availableSpecs =
{
RC2ParameterSpec.class,
RC5ParameterSpec.class,
IvParameterSpec.class,
PBEParameterSpec.class,
GOST28147ParameterSpec.class
};
private BlockCipher baseEngine;
private BlockCipherProvider engineProvider;
private GenericBlockCipher cipher;
private ParametersWithIV ivParam;
private int ivLength = 0;
private boolean padded;
private PBEParameterSpec pbeSpec = null;
private String pbeAlgorithm = null;
private String modeName = null;
protected BaseBlockCipher(
BlockCipher engine)
{
baseEngine = engine;
cipher = new BufferedGenericBlockCipher(engine);
}
protected BaseBlockCipher(
BlockCipherProvider provider)
{
baseEngine = provider.get();
engineProvider = provider;
cipher = new BufferedGenericBlockCipher(provider.get());
}
protected BaseBlockCipher(
org.bouncycastle.crypto.BlockCipher engine,
int ivLength)
{
baseEngine = engine;
this.cipher = new BufferedGenericBlockCipher(engine);
this.ivLength = ivLength / 8;
}
protected BaseBlockCipher(
BufferedBlockCipher engine,
int ivLength)
{
baseEngine = engine.getUnderlyingCipher();
this.cipher = new BufferedGenericBlockCipher(engine);
this.ivLength = ivLength / 8;
}
protected int engineGetBlockSize()
{
return baseEngine.getBlockSize();
}
protected byte[] engineGetIV()
{
return (ivParam != null) ? ivParam.getIV() : null;
}
protected int engineGetKeySize(
Key key)
{
return key.getEncoded().length * 8;
}
protected int engineGetOutputSize(
int inputLen)
{
return cipher.getOutputSize(inputLen);
}
protected AlgorithmParameters engineGetParameters()
{
if (engineParams == null)
{
if (pbeSpec != null)
{
try
{
engineParams = AlgorithmParameters.getInstance(pbeAlgorithm, BouncyCastleProvider.PROVIDER_NAME);
engineParams.init(pbeSpec);
}
catch (Exception e)
{
return null;
}
}
else if (ivParam != null)
{
String name = cipher.getUnderlyingCipher().getAlgorithmName();
if (name.indexOf('/') >= 0)
{
name = name.substring(0, name.indexOf('/'));
}
try
{
engineParams = AlgorithmParameters.getInstance(name, BouncyCastleProvider.PROVIDER_NAME);
engineParams.init(ivParam.getIV());
}
catch (Exception e)
{
throw new RuntimeException(e.toString());
}
}
}
return engineParams;
}
protected void engineSetMode(
String mode)
throws NoSuchAlgorithmException
{
modeName = Strings.toUpperCase(mode);
if (modeName.equals("ECB"))
{
ivLength = 0;
cipher = new BufferedGenericBlockCipher(baseEngine);
}
else if (modeName.equals("CBC"))
{
ivLength = baseEngine.getBlockSize();
cipher = new BufferedGenericBlockCipher(
new CBCBlockCipher(baseEngine));
}
else if (modeName.startsWith("OFB"))
{
ivLength = baseEngine.getBlockSize();
if (modeName.length() != 3)
{
int wordSize = Integer.parseInt(modeName.substring(3));
cipher = new BufferedGenericBlockCipher(
new OFBBlockCipher(baseEngine, wordSize));
}
else
{
cipher = new BufferedGenericBlockCipher(
new OFBBlockCipher(baseEngine, 8 * baseEngine.getBlockSize()));
}
}
else if (modeName.startsWith("CFB"))
{
ivLength = baseEngine.getBlockSize();
if (modeName.length() != 3)
{
int wordSize = Integer.parseInt(modeName.substring(3));
cipher = new BufferedGenericBlockCipher(
new CFBBlockCipher(baseEngine, wordSize));
}
else
{
cipher = new BufferedGenericBlockCipher(
new CFBBlockCipher(baseEngine, 8 * baseEngine.getBlockSize()));
}
}
else if (modeName.startsWith("PGP"))
{
boolean inlineIV = modeName.equalsIgnoreCase("PGPCFBwithIV");
ivLength = baseEngine.getBlockSize();
cipher = new BufferedGenericBlockCipher(
new PGPCFBBlockCipher(baseEngine, inlineIV));
}
else if (modeName.equalsIgnoreCase("OpenPGPCFB"))
{
ivLength = 0;
cipher = new BufferedGenericBlockCipher(
new OpenPGPCFBBlockCipher(baseEngine));
}
else if (modeName.startsWith("SIC"))
{
ivLength = baseEngine.getBlockSize();
if (ivLength < 16)
{
throw new IllegalArgumentException("Warning: SIC-Mode can become a twotime-pad if the blocksize of the cipher is too small. Use a cipher with a block size of at least 128 bits (e.g. AES)");
}
cipher = new BufferedGenericBlockCipher(new BufferedBlockCipher(
new SICBlockCipher(baseEngine)));
}
else if (modeName.startsWith("CTR"))
{
ivLength = baseEngine.getBlockSize();
cipher = new BufferedGenericBlockCipher(new BufferedBlockCipher(
new SICBlockCipher(baseEngine)));
}
else if (modeName.startsWith("GOFB"))
{
ivLength = baseEngine.getBlockSize();
cipher = new BufferedGenericBlockCipher(new BufferedBlockCipher(
new GOFBBlockCipher(baseEngine)));
}
else if (modeName.startsWith("CTS"))
{
ivLength = baseEngine.getBlockSize();
cipher = new BufferedGenericBlockCipher(new CTSBlockCipher(new CBCBlockCipher(baseEngine)));
}
else if (modeName.startsWith("CCM"))
{
ivLength = baseEngine.getBlockSize();
cipher = new AEADGenericBlockCipher(new CCMBlockCipher(baseEngine));
}
else if (modeName.startsWith("OCB"))
{
if (engineProvider != null)
{
ivLength = baseEngine.getBlockSize();
cipher = new AEADGenericBlockCipher(new OCBBlockCipher(baseEngine, engineProvider.get()));
}
else
{
throw new NoSuchAlgorithmException("can't support mode " + mode);
}
}
else if (modeName.startsWith("EAX"))
{
ivLength = baseEngine.getBlockSize();
cipher = new AEADGenericBlockCipher(new EAXBlockCipher(baseEngine));
}
else if (modeName.startsWith("GCM"))
{
ivLength = baseEngine.getBlockSize();
cipher = new AEADGenericBlockCipher(new GCMBlockCipher(baseEngine));
}
else
{
throw new NoSuchAlgorithmException("can't support mode " + mode);
}
}
protected void engineSetPadding(
String padding)
throws NoSuchPaddingException
{
String paddingName = Strings.toUpperCase(padding);
if (paddingName.equals("NOPADDING"))
{
if (cipher.wrapOnNoPadding())
{
cipher = new BufferedGenericBlockCipher(new BufferedBlockCipher(cipher.getUnderlyingCipher()));
}
}
else if (paddingName.equals("WITHCTS"))
{
cipher = new BufferedGenericBlockCipher(new CTSBlockCipher(cipher.getUnderlyingCipher()));
}
else
{
padded = true;
if (isAEADModeName(modeName))
{
throw new NoSuchPaddingException("Only NoPadding can be used with AEAD modes.");
}
else if (paddingName.equals("PKCS5PADDING") || paddingName.equals("PKCS7PADDING"))
{
cipher = new BufferedGenericBlockCipher(cipher.getUnderlyingCipher());
}
else if (paddingName.equals("ZEROBYTEPADDING"))
{
cipher = new BufferedGenericBlockCipher(cipher.getUnderlyingCipher(), new ZeroBytePadding());
}
else if (paddingName.equals("ISO10126PADDING") || paddingName.equals("ISO10126-2PADDING"))
{
cipher = new BufferedGenericBlockCipher(cipher.getUnderlyingCipher(), new ISO10126d2Padding());
}
else if (paddingName.equals("X9.23PADDING") || paddingName.equals("X923PADDING"))
{
cipher = new BufferedGenericBlockCipher(cipher.getUnderlyingCipher(), new X923Padding());
}
else if (paddingName.equals("ISO7816-4PADDING") || paddingName.equals("ISO9797-1PADDING"))
{
cipher = new BufferedGenericBlockCipher(cipher.getUnderlyingCipher(), new ISO7816d4Padding());
}
else if (paddingName.equals("TBCPADDING"))
{
cipher = new BufferedGenericBlockCipher(cipher.getUnderlyingCipher(), new TBCPadding());
}
else
{
throw new NoSuchPaddingException("Padding " + padding + " unknown.");
}
}
}
protected void engineInit(
int opmode,
Key key,
AlgorithmParameterSpec params,
SecureRandom random)
throws InvalidKeyException, InvalidAlgorithmParameterException
{
CipherParameters param;
this.pbeSpec = null;
this.pbeAlgorithm = null;
this.engineParams = null;
//
// basic key check
//
if (!(key instanceof SecretKey))
{
throw new InvalidKeyException("Key for algorithm " + key.getAlgorithm() + " not suitable for symmetric enryption.");
}
//
// for RC5-64 we must have some default parameters
//
if (params == null && baseEngine.getAlgorithmName().startsWith("RC5-64"))
{
throw new InvalidAlgorithmParameterException("RC5 requires an RC5ParametersSpec to be passed in.");
}
//
// a note on iv's - if ivLength is zero the IV gets ignored (we don't use it).
//
if (key instanceof BCPBEKey)
{
BCPBEKey k = (BCPBEKey)key;
if (k.getOID() != null)
{
pbeAlgorithm = k.getOID().getId();
}
else
{
pbeAlgorithm = k.getAlgorithm();
}
if (k.getParam() != null)
{
param = k.getParam();
if (params instanceof IvParameterSpec)
{
IvParameterSpec iv = (IvParameterSpec)params;
param = new ParametersWithIV(param, iv.getIV());
}
}
else if (params instanceof PBEParameterSpec)
{
pbeSpec = (PBEParameterSpec)params;
param = PBE.Util.makePBEParameters(k, params, cipher.getUnderlyingCipher().getAlgorithmName());
}
else
{
throw new InvalidAlgorithmParameterException("PBE requires PBE parameters to be set.");
}
if (param instanceof ParametersWithIV)
{
ivParam = (ParametersWithIV)param;
}
}
else if (params == null)
{
param = new KeyParameter(key.getEncoded());
}
else if (params instanceof IvParameterSpec)
{
if (ivLength != 0)
{
IvParameterSpec p = (IvParameterSpec)params;
if (p.getIV().length != ivLength && !isAEADModeName(modeName))
{
throw new InvalidAlgorithmParameterException("IV must be " + ivLength + " bytes long.");
}
if (key instanceof RepeatedSecretKeySpec)
{
param = new ParametersWithIV(null, p.getIV());
ivParam = (ParametersWithIV)param;
}
else
{
param = new ParametersWithIV(new KeyParameter(key.getEncoded()), p.getIV());
ivParam = (ParametersWithIV)param;
}
}
else
{
if (modeName != null && modeName.equals("ECB"))
{
throw new InvalidAlgorithmParameterException("ECB mode does not use an IV");
}
param = new KeyParameter(key.getEncoded());
}
}
else if (params instanceof GOST28147ParameterSpec)
{
GOST28147ParameterSpec gost28147Param = (GOST28147ParameterSpec)params;
param = new ParametersWithSBox(
new KeyParameter(key.getEncoded()), ((GOST28147ParameterSpec)params).getSbox());
if (gost28147Param.getIV() != null && ivLength != 0)
{
param = new ParametersWithIV(param, gost28147Param.getIV());
ivParam = (ParametersWithIV)param;
}
}
else if (params instanceof RC2ParameterSpec)
{
RC2ParameterSpec rc2Param = (RC2ParameterSpec)params;
param = new RC2Parameters(key.getEncoded(), ((RC2ParameterSpec)params).getEffectiveKeyBits());
if (rc2Param.getIV() != null && ivLength != 0)
{
param = new ParametersWithIV(param, rc2Param.getIV());
ivParam = (ParametersWithIV)param;
}
}
else if (params instanceof RC5ParameterSpec)
{
RC5ParameterSpec rc5Param = (RC5ParameterSpec)params;
param = new RC5Parameters(key.getEncoded(), ((RC5ParameterSpec)params).getRounds());
if (baseEngine.getAlgorithmName().startsWith("RC5"))
{
if (baseEngine.getAlgorithmName().equals("RC5-32"))
{
if (rc5Param.getWordSize() != 32)
{
throw new InvalidAlgorithmParameterException("RC5 already set up for a word size of 32 not " + rc5Param.getWordSize() + ".");
}
}
else if (baseEngine.getAlgorithmName().equals("RC5-64"))
{
if (rc5Param.getWordSize() != 64)
{
throw new InvalidAlgorithmParameterException("RC5 already set up for a word size of 64 not " + rc5Param.getWordSize() + ".");
}
}
}
else
{
throw new InvalidAlgorithmParameterException("RC5 parameters passed to a cipher that is not RC5.");
}
if ((rc5Param.getIV() != null) && (ivLength != 0))
{
param = new ParametersWithIV(param, rc5Param.getIV());
ivParam = (ParametersWithIV)param;
}
}
else
{
throw new InvalidAlgorithmParameterException("unknown parameter type.");
}
if ((ivLength != 0) && !(param instanceof ParametersWithIV))
{
SecureRandom ivRandom = random;
if (ivRandom == null)
{
ivRandom = new SecureRandom();
}
if ((opmode == Cipher.ENCRYPT_MODE) || (opmode == Cipher.WRAP_MODE))
{
byte[] iv = new byte[ivLength];
ivRandom.nextBytes(iv);
param = new ParametersWithIV(param, iv);
ivParam = (ParametersWithIV)param;
}
else if (cipher.getUnderlyingCipher().getAlgorithmName().indexOf("PGPCFB") < 0)
{
throw new InvalidAlgorithmParameterException("no IV set when one expected");
}
}
if (random != null && padded)
{
param = new ParametersWithRandom(param, random);
}
try
{
switch (opmode)
{
case Cipher.ENCRYPT_MODE:
case Cipher.WRAP_MODE:
cipher.init(true, param);
break;
case Cipher.DECRYPT_MODE:
case Cipher.UNWRAP_MODE:
cipher.init(false, param);
break;
default:
throw new InvalidParameterException("unknown opmode " + opmode + " passed");
}
}
catch (Exception e)
{
throw new InvalidKeyException(e.getMessage());
}
}
protected void engineInit(
int opmode,
Key key,
AlgorithmParameters params,
SecureRandom random)
throws InvalidKeyException, InvalidAlgorithmParameterException
{
AlgorithmParameterSpec paramSpec = null;
if (params != null)
{
for (int i = 0; i != availableSpecs.length; i++)
{
try
{
paramSpec = params.getParameterSpec(availableSpecs[i]);
break;
}
catch (Exception e)
{
// try again if possible
}
}
if (paramSpec == null)
{
throw new InvalidAlgorithmParameterException("can't handle parameter " + params.toString());
}
}
engineInit(opmode, key, paramSpec, random);
engineParams = params;
}
protected void engineInit(
int opmode,
Key key,
SecureRandom random)
throws InvalidKeyException
{
try
{
engineInit(opmode, key, (AlgorithmParameterSpec)null, random);
}
catch (InvalidAlgorithmParameterException e)
{
throw new InvalidKeyException(e.getMessage());
}
}
protected byte[] engineUpdate(
byte[] input,
int inputOffset,
int inputLen)
{
int length = cipher.getUpdateOutputSize(inputLen);
if (length > 0)
{
byte[] out = new byte[length];
int len = cipher.processBytes(input, inputOffset, inputLen, out, 0);
if (len == 0)
{
return null;
}
else if (len != out.length)
{
byte[] tmp = new byte[len];
System.arraycopy(out, 0, tmp, 0, len);
return tmp;
}
return out;
}
cipher.processBytes(input, inputOffset, inputLen, null, 0);
return null;
}
protected int engineUpdate(
byte[] input,
int inputOffset,
int inputLen,
byte[] output,
int outputOffset)
throws ShortBufferException
{
try
{
return cipher.processBytes(input, inputOffset, inputLen, output, outputOffset);
}
catch (DataLengthException e)
{
throw new ShortBufferException(e.getMessage());
}
}
protected byte[] engineDoFinal(
byte[] input,
int inputOffset,
int inputLen)
throws IllegalBlockSizeException, BadPaddingException
{
int len = 0;
byte[] tmp = new byte[engineGetOutputSize(inputLen)];
if (inputLen != 0)
{
len = cipher.processBytes(input, inputOffset, inputLen, tmp, 0);
}
try
{
len += cipher.doFinal(tmp, len);
}
catch (DataLengthException e)
{
throw new IllegalBlockSizeException(e.getMessage());
}
catch (InvalidCipherTextException e)
{
throw new BadPaddingException(e.getMessage());
}
if (len == tmp.length)
{
return tmp;
}
byte[] out = new byte[len];
System.arraycopy(tmp, 0, out, 0, len);
return out;
}
protected int engineDoFinal(
byte[] input,
int inputOffset,
int inputLen,
byte[] output,
int outputOffset)
throws IllegalBlockSizeException, BadPaddingException, ShortBufferException
{
try
{
int len = 0;
if (inputLen != 0)
{
len = cipher.processBytes(input, inputOffset, inputLen, output, outputOffset);
}
return (len + cipher.doFinal(output, outputOffset + len));
}
catch (OutputLengthException e)
{
throw new ShortBufferException(e.getMessage());
}
catch (DataLengthException e)
{
throw new IllegalBlockSizeException(e.getMessage());
}
catch (InvalidCipherTextException e)
{
throw new BadPaddingException(e.getMessage());
}
}
private boolean isAEADModeName(
String modeName)
{
return "CCM".equals(modeName) || "EAX".equals(modeName) || "GCM".equals(modeName) || "OCB".equals(modeName);
}
/*
* The ciphers that inherit from us.
*/
static private interface GenericBlockCipher
{
public void init(boolean forEncryption, CipherParameters params)
throws IllegalArgumentException;
public boolean wrapOnNoPadding();
public String getAlgorithmName();
public org.bouncycastle.crypto.BlockCipher getUnderlyingCipher();
public int getOutputSize(int len);
public int getUpdateOutputSize(int len);
public int processByte(byte in, byte[] out, int outOff)
throws DataLengthException;
public int processBytes(byte[] in, int inOff, int len, byte[] out, int outOff)
throws DataLengthException;
public int doFinal(byte[] out, int outOff)
throws IllegalStateException, InvalidCipherTextException;
}
private static class BufferedGenericBlockCipher
implements GenericBlockCipher
{
private BufferedBlockCipher cipher;
BufferedGenericBlockCipher(BufferedBlockCipher cipher)
{
this.cipher = cipher;
}
BufferedGenericBlockCipher(org.bouncycastle.crypto.BlockCipher cipher)
{
this.cipher = new PaddedBufferedBlockCipher(cipher);
}
BufferedGenericBlockCipher(org.bouncycastle.crypto.BlockCipher cipher, BlockCipherPadding padding)
{
this.cipher = new PaddedBufferedBlockCipher(cipher, padding);
}
public void init(boolean forEncryption, CipherParameters params)
throws IllegalArgumentException
{
cipher.init(forEncryption, params);
}
public boolean wrapOnNoPadding()
{
return !(cipher instanceof CTSBlockCipher);
}
public String getAlgorithmName()
{
return cipher.getUnderlyingCipher().getAlgorithmName();
}
public org.bouncycastle.crypto.BlockCipher getUnderlyingCipher()
{
return cipher.getUnderlyingCipher();
}
public int getOutputSize(int len)
{
return cipher.getOutputSize(len);
}
public int getUpdateOutputSize(int len)
{
return cipher.getUpdateOutputSize(len);
}
public int processByte(byte in, byte[] out, int outOff) throws DataLengthException
{
return cipher.processByte(in, out, outOff);
}
public int processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) throws DataLengthException
{
return cipher.processBytes(in, inOff, len, out, outOff);
}
public int doFinal(byte[] out, int outOff) throws IllegalStateException, InvalidCipherTextException
{
return cipher.doFinal(out, outOff);
}
}
private static class AEADGenericBlockCipher
implements GenericBlockCipher
{
private AEADBlockCipher cipher;
AEADGenericBlockCipher(AEADBlockCipher cipher)
{
this.cipher = cipher;
}
public void init(boolean forEncryption, CipherParameters params)
throws IllegalArgumentException
{
cipher.init(forEncryption, params);
}
public String getAlgorithmName()
{
return cipher.getUnderlyingCipher().getAlgorithmName();
}
public boolean wrapOnNoPadding()
{
return false;
}
public org.bouncycastle.crypto.BlockCipher getUnderlyingCipher()
{
return cipher.getUnderlyingCipher();
}
public int getOutputSize(int len)
{
return cipher.getOutputSize(len);
}
public int getUpdateOutputSize(int len)
{
return cipher.getUpdateOutputSize(len);
}
public int processByte(byte in, byte[] out, int outOff) throws DataLengthException
{
return cipher.processByte(in, out, outOff);
}
public int processBytes(byte[] in, int inOff, int len, byte[] out, int outOff) throws DataLengthException
{
return cipher.processBytes(in, inOff, len, out, outOff);
}
public int doFinal(byte[] out, int outOff) throws IllegalStateException, InvalidCipherTextException
{
return cipher.doFinal(out, outOff);
}
}
}